docs: def datasets_list(self, project_id=None, max_results=0, page_token=None):
      """Issues a request to list the datasets in the project.
  
      Args:
        project_id: the project id to use to fetch the results; use None for the default project.
        max_results: an optional maximum number of tables to retrieve.
        page_token: an optional token to continue the retrieval.
      Returns:
        A parsed result object.
      Raises:
        Exception if there is an error performing the operation.
      """
      if project_id is None:
        project_id = self._project_id
      url = Api._ENDPOINT + (Api._DATASETS_PATH % (project_id, ''))
  
      args = {}
      if max_results != 0:
        args['maxResults'] = max_results
      if page_token is not None:
        args['pageToken'] = page_token
  
      return datalab.utils.Http.request(url, args=args, credentials=self._credentials)